Chapter 5 _______________________________________________ Wiring and Power Management
VAISALA_______________________________________________________________________ 67
Data Communication Interfaces
1508-079
Figure 34 Data Communication Interfaces
With RS-485 and RS-422 interfaces, if the data rate is 9600 Bd or higher
and the cabling from the transmitter to the host is 600 m (2000 ft) or
longer, you must use termination resistors at both ends of the line.
The WXT530 series transmitters with serial communication interface
have a built-in termination options. Plain resistor (R) termination or
termination with resistor connected series with capacitor can be selected
with jumpers. By default, no termination is selected. In RS-422 mode,
built-in termination is only between RX- and RX+ lines.
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